Malicious PDF — malware analysis report

Static analysis result for SHA-256 826bd684ccdc264a…

MALICIOUS

PDF

73.1 KB Created: 2021-02-10 19:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e4cd0a78cecf4ad55a4cd5d66530199c SHA-1: ee335b8d7a635869f04eaa0f17d15793d731817f SHA-256: 826bd684ccdc264ac5ca99f92bfa5558becae0c4e86248d5c4f377e0a3558dc4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm designed to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of a URL with 'descargar block world apk' suggests a lure for downloading an application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://seumenha.ru/123?utm_term=descargar+block+world+apk PDF link annotation
    • https://cdn.sqhk.co/buzivafulet/jcFjhVU/jeziluvixerejijifumupu.pdfIn PDF document text
    • http://mijuxub.66ghz.com/tafupazuwasavesaxilukij.pdfIn PDF document text
    • https://cdn.sqhk.co/wekonexiw/jfsyzKq/drop_it_meme_gacha_life.pdfIn PDF document text
    • https://wiromokuxuzub.weebly.com/uploads/1/3/5/2/135298753/dinorezilufiz.pdfIn PDF document text
    • https://cdn.sqhk.co/tusadopovet/TKicUhK/descargar_angry_neighbor_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408324/normal_6015d8dcb93d1.pdfIn PDF document text
    • http://xurixekan.22web.org/wusutemuson.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/fhhgfjs/wofiparamudenufaxu.pdfIn PDF document text
    • https://golotarati.weebly.com/uploads/1/3/1/8/131856611/nowewalisojij.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxawexa/pjfaYii/i_don_t_know_song_lyrics_in_english.pdfIn PDF document text
    • http://jukekabotika.22web.org/haryana_sports_cash_award_form_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370996/normal_5ff95fa6eb488.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_60228eb7c962b.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/5djehgn/neloloxapotamirakugi.pdfIn PDF document text
    • https://lolidinol.weebly.com/uploads/1/3/4/8/134884516/tazopab.pdfIn PDF document text
    • http://faketikus.22web.org/barfi_movie_songs_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488807/normal_5feb637c1e18a.pdfIn PDF document text
    • https://pozemake.weebly.com/uploads/1/3/0/7/130776760/6778d904d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bexadujozopu.epizy.com/steam_stuck_at_allocating_disk_space.pdfIn PDF document text
    • http://zefifimagami.epizy.com/57022663792.pdfIn PDF document text
    • http://duwufinojitu.rf.gd/african_cichlid_care_sheet.pdfIn PDF document text
    • http://morisexisaxewa.epizy.com/auto_enrolment_letter_templates_nest.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBF 5536 bytes
SHA-256: 4f37c0692313fed7c6c0365674c4a06b271757bc0807d0826759ea088af6bea0
font_01_sfnt_off0000f0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B8 11788 bytes
SHA-256: d5f42682abc22c19507fda888276371435925346ce0fcd09a1b756aa9c1d5139

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